On a windy November day, bundled-up workers hammer the joints where the copper sheets meet the battens on the dome roof. After hammering the copper together, they will solder the joints to make them watertight. It's a very time-consuming process! Meanwhile, more workers are lying down on the job to seal the windows in the cupola in anticipation of the inclement weather we are supposed to get over the next couple of days.
Click on the post title for a video of workers hammering the copper.